Velti, a global provider of mobile marketing and advertising technology, thas reported in their monthly "State of Mobile Advertising" report that Android notched a second consecutive month of ad share gains on iOS in August, now taking 43% of served mobile ad impressions compared to 57% for Apple.

In July, Android held 42% of ad impressions compared to 58% for Apple. This comes on the heal of the news that Samsung sold more devices than Apple and other manufacturers in Q2 2012.

If history is any guide, the new iPhone 5 could end the trend. Velti reported that in the two months following the introduction of iPhone 4S, Android ad share plummeted 5%. Velti also said it expects the iPhone 5 will account for more than 25% of total iOS mobile impressions in just six months.

"This is the first time we’ve seen Android net gains in two consecutive months, and it’s a drastic turnaround from the beginning of the year when Apple continued to soar," says Krishna Subramanian, CMO of Velti. "But we also think the iPhone 5 is a game changer, within 6 months, iPhone 5 will likely become one of the top 5 devices on the exchange."

In other mobile industry trends, Velti reported that AT&T remains the most dominant smartphone carrier in the U.S., accounting for 51% of the smartphone market. Sprint was the only U.S. carrier to gain marketshare in August, gaining 2%. Both Verizon and AT&T lost 1% share in the month.

The data for the report is taken from the Mobclix Exchange, which sits at the intersection of 33,500-plus apps and 45-plus ad networks. To download the full report, please visit http://www.velti.com/data_reports.html .